期刊
ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES
卷 74, 期 -, 页码 647-658出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S2053273318011439
关键词
Z-module; defects; twins; dislocations; HREM-HAADF
资金
- Equipex TEMPOS [ANR-10-EQPX-50]
- French ANR [ANR METADIS 13-BS04-0005]
Some specific structures of intermetallic alloys, like approximants of quasicrystals, have their unit cells and most of their atoms located on a periodic fraction of the nodes of a unique Z-module [a set of the irrational projections of the nodes of a (N > 3-dimensional) lattice]. Those hidden internal symmetries generate possible new kinds of defects like coherent twins, translation defects and so-called module dislocations that have already been discussed elsewhere [Quiquandon et al. (2016). Acta Cryst. A72, 55-61; Sirindil et al. (2017). Acta Cryst. A73, 427-437]. Presented here are electron microscopy observations of the orthorhombic phase NiZr - and its low-temperature monoclinic variant which reveal the existence of such defects based on the underlying Z-module generated by the five vertices of the regular pentagon. New high-resolution electron microscopy (HREM) and scanning transmission electron microscopy high-angle annular dark-field (STEM-HAADF) observations demonstrate the agreement between the geometrical description of the structure in five dimensions and the experimental observations of fivefold twins and translation defects.
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